JP7398040B2 - Construction method for elbow joints and pipes - Google Patents

Description

The present invention relates to an elbow joint and a method of constructing a pipe using the elbow joint.

FIG. 5 shows an elbow joint 101 disclosed in Patent Document 1. The elbow joint 101 has one joint main body 102 into which a resin pipe 151 is inserted and connected, the other joint main body 102 into which a resin pipe 151 of the same size as the resin pipe 151 is inserted and connected, one joint main body 102 and A retaining mechanism 103 constructed on the other joint body 102 and consisting of a one-touch joint for holding the corresponding resin pipe 151, and a cap 104 for attaching the retaining mechanism 103 to the corresponding joint body 102. We are prepared. One joint main body 102 and the other joint main body 102 are arranged so that their axes L3 and L4 intersect at right angles.

Each joint body 102 is provided with a positioning surface 102a that defines the insertion position of the corresponding resin pipe 151. Based on the intersection Q between the axis L3 of one joint body 102 and the axis L4 of the other joint body 102, the positioning surface 102a of one joint body 102 and the positioning surface 102a of the other joint body 102 correspond to each other. Distances C3 and C4 in the directions of axes L3 and L4 are set to be the same. Therefore, the distance D3 from the intersection Q to the pipe insertion port 104a of the cap 104 corresponding to one joint body 102, and the distance D4 from the intersection Q to the pipe insertion port 104a of the cap 104 corresponding to the other joint body 102 are It's the same.

JP2019-011857A

However, as shown in FIG. 6, when constructing a pipe line that goes over a small step (in/out gap) K using two elbow fittings 101, the elbow fittings 101 have a distance D3 from the intersection Q to the pipe insertion port 104a. , D4 (see FIG. 5) are absolutely long, so there is a problem in that the elbow joint 101 corresponding to the protrusion cannot be properly arranged along the protrusion.
An object of the present invention is to provide an elbow pipe fitting that can be suitably applied to a pipe line that overcomes small gaps in entry and exit, and a method of constructing a pipe line using the elbow pipe joint.

To achieve the above object, the elbow pipe joint of the invention of claim 1 has one joint body into which a resin pipe is inserted and connected, and the other joint body into which a resin pipe of the same size as the resin pipe is inserted and connected. , a retaining mechanism constructed on the one joint body and the other joint body, each consisting of a one-touch joint for holding the corresponding resin pipe; and attaching the retaining mechanism to the corresponding joint body. In the elbow pipe joint, the one joint body and the other joint body are arranged such that their axes intersect at right angles, and each joint body has a corresponding one of the resin pipes. A positioning surface that defines an insertion position is provided, and when the intersection of the axis of the one joint body and the axis of the other joint body is used as a reference, the positioning surface of the one joint body is set to the position of the other joint body. By providing the body at a position closer to the intersection in the axial direction than the positioning surface of the main body, the distance from the intersection to the pipe insertion port of the cap attached to the one joint body can be reduced from the intersection to the other joint body. The distance is shorter than the distance from the pipe insertion port of the cap attached to the pipe.

In order to achieve the above object, the invention of claim 2 is a method of constructing a conduit that overcomes an entry/exit gap, wherein two elbow pipe joints of claim 1 are used, and one of the two elbow pipe joints is This is a conduit construction method in which the joint bodies are placed between the protruding and inward corners.

A vertical cross-sectional view of an elbow pipe joint. FIG. 3 is a vertical cross-sectional view of a conduit constructed using an elbow joint. FIG. 7 is a vertical cross-sectional view of another example of an elbow pipe joint. FIG. 7 is a vertical cross-sectional view of another example of an elbow pipe joint. A vertical cross-sectional view of a conventional elbow pipe joint. FIG. 2 is a vertical cross-sectional view of a pipe constructed using a conventional elbow joint.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in which the present invention is embodied in a pipe for water supply and hot water supply will be described below.
As shown in FIG. 1, the elbow joint 11 includes two cylindrical joint bodies 12 into which pipes 50 of the same size are inserted and connected. Each joint body 12 is made of synthetic resin such as polyphenylene sulfide resin. The piping 50 is formed by inserting a cylindrical in-core 52 into the end of a resin pipe 51. The resin pipe 51 is made of synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.). The in-core 52 is prevented from sinking into the resin pipe 51 by a flange 52a formed at the end of the in-core 52. The in-core 52 is for maintaining a high degree of roundness at the end of the resin pipe 51.

In the elbow joint 11, one joint main body 12 and the other joint main body 12 are arranged so that their axes L1 and L2 intersect at right angles. One joint main body 12 and the other joint main body 12 have the same structure except for a part, and a one-touch joint with the same structure is constructed in one joint main body 12 and the other joint main body 12. Therefore, unless an explanation is necessary, only one joint body 12 will be described with respect to the same parts, and a description of the other joint body 12 will be omitted.

An outer cylindrical portion 15 is formed protruding from the joint body 12 . An insertion space 13 into which the piping 50 is inserted is formed inside the outer cylindrical portion 15 . A stepped portion 15a is provided on the proximal end side of the inner circumferential surface of the outer cylinder portion 15. A locking step 15b is provided on the inner circumferential surface of the outer cylindrical portion 15 on the distal end side of the step portion 15a. A positioning surface 15c is provided at the proximal end of the inner circumferential surface of the outer cylinder portion 15 to abut the distal end surface of the in-core 52 and define the insertion position of the pipe 50. The positioning surface 15c exists on a virtual plane orthogonal to the axes L1 and L2 of the corresponding joint body 12.

A seal ring holder 16 made of polyacetal resin is locked to the locking step 15b. A pair of seal rings 17 made of rubber, such as ethylene-propylene-diene copolymer rubber, are arranged at intervals between the seal ring retainer 16 and the stepped portion 15a. A spacer ring 18 is arranged between the pair of seal rings 17. When the pipe 50 is inserted into the insertion space 13, the seal ring 17 is crushed between the outer circumferential surface of the resin pipe 51 and the inner circumferential surface of the outer cylinder part 15, thereby ensuring watertightness between both circumferential surfaces. be done.

The elbow joint 11 includes a retaining mechanism 23 for holding the pipe 50 on the joint body 12 and a cap 20 for attaching the retaining mechanism 23 to the joint body 12. The cap 20 is made of synthetic resin such as polyphenylene sulfide resin. Two locking grooves 21 are formed on the inner peripheral surface of the cap 20. Two locking protrusions 19 are formed on the outer peripheral surface of the outer cylindrical portion 15 . The cap 20 is fitted onto the outer cylinder part 15 and connected to the outer cylinder part 15 by the locking groove 21 snap-engaging with the locking protrusion 19 of the outer cylinder part 15. . The cap 20 is provided with an inclined surface 22 on the inner circumferential surface of the distal end, the diameter of which decreases toward the distal end.

The lock ring 24 constituting the retaining mechanism 23 is made of a thin metal plate such as stainless steel and has an annular shape. A plurality of retaining pieces 24a are formed on the inner peripheral portion of the lock ring 24 so as to protrude and incline toward the inner end. A split ring 26 constituting a retaining mechanism 23 is interposed between the lock ring 24 and the cap 20. The split ring 26 is made of synthetic resin such as polyphenylene sulfide resin. The split ring 26 backs up and maintains the inclination angle of the retaining piece 24a of the lock ring 24.

A lock ring holder 25 constituting a retaining mechanism 23 is sandwiched between the seal ring holder 16 and the cap 20. A lock ring 24 is held between the lock ring presser 25 and the split ring 26. It is assumed that a pulling force is applied to the pipe 50 that has been inserted into the insertion space 13 and passed through the split ring 26 and the lock ring 24 . In this case, the retaining piece 24a of the lock ring 24 bites into the outer peripheral surface of the resin pipe 51, thereby preventing the pipe 50 from coming off from the elbow joint 11. Further, in this case, the diameter of the split ring 26 is reduced by being guided by the inclined surface 22 of the cap 20 and tightens the outer peripheral surface of the resin pipe 51, thereby preventing the pipe 50 from coming off from the elbow joint 11.

Now, as described above, the one-touch joint body 12 and the other joint body 12 have the same structure as a one-touch joint. Moreover, piping 50 of the same size is inserted and connected to one joint main body 12 and the other joint main body 12. Therefore, the distance C1 in the direction of the axis L1 from the positioning surface 15c of one joint main body 12 (hereinafter referred to as "joint main body 12S") to the pipe insertion opening 20a of the cap 20 corresponding to the joint main body 12S, and the distance C1 in the direction of the axis L1, The distance C2 in the direction of the axis L2 from the positioning surface 15c of the main body 12 (hereinafter referred to as "the joint main body 12L") to the pipe insertion opening 20a of the cap 20 corresponding to the joint main body 12L is the same.

However, when the intersection point P between the axis L1 of the joint body 12S and the axis L2 of the joint body 12L is used as a reference, the positioning surface 15c of the joint body 12S is more aligned with the corresponding axes L1 and L2 than the positioning surface 15c of the joint body 12L. It is provided at a position close to the intersection P in the direction. Therefore, the distance D1 in the direction of the axis L1 from the intersection P to the pipe insertion port 20a corresponding to the joint body 12S is longer than the distance D2 in the direction of the axis L2 from the intersection P to the pipe insertion port 20a corresponding to the joint body 12L. short.

Accordingly, the flesh portion 15d in the vicinity of the positioning surface 15c in the joint body 12S protrudes into the L-shaped flow path 31 located at the boundary between the joint body 12S and the joint body 12L, and furthermore, the joint body 15d with respect to the flow path 31 It penetrates into the vicinity of the axis L2 of the main body 12L. Therefore, in the flow path 31, the passage cross-sectional area of hot water decreases from the joint main body 12L side to the joint main body 12S side due to the protrusion of the flesh portion 15d. In order to moderate the decrease in the passage cross-sectional area, a portion 31a corresponding to the flesh portion 15d on the inner surface of the flow path 31 is formed in a tapered shape.

By forming the portion 31a of the flow path 31 into a tapered shape, a portion of the flow of hot water that exits the joint body 12L and heads toward the joint body 12S side is bent toward the opposite side from the portion 31a. Therefore, a notch 15c-1 is formed on the positioning surface 15c of the joint body 12L on the side opposite to the portion 31a, and the flow path 31 is also shaped to connect to the notch 15c-1 without a step. As a result, the aforementioned bending of the flow of hot water is performed smoothly. In addition, a notch 15c-2 is also formed in the positioning surface 15c of the joint body 12S at a portion corresponding to the inside of the L-shape of the flow path 31, so that hot water can be removed between the joint body 12L and the joint body 12S. The flow is smoothly bent in the flow path 31.

In the above embodiment, the following effects can be achieved.
(1) As shown in Fig. 2, when constructing a conduit that goes over a small step (in/out gap) K using two elbow fittings 11, the fitting bodies 12S with a short distance D1 (see Fig. 1) By arranging the elbow joint 11 between the protrusion and the indentation, the elbow joint 11 corresponding to the protrusion can be placed particularly well along the protrusion.

(2) Since the retaining mechanism 23 of the elbow joint 11 is a one-touch joint, construction (connection) in which the distance between the pipe insertion ports 20a on the mutually opposing joint bodies 12S sides of the two elbow joints 11 is made almost zero. This makes it possible to cope particularly well with small in/out gaps K.

(Another example)
The above embodiment can be modified as follows, for example.
- As shown in FIG. 3, the portion 31a corresponding to the flesh portion 15d on the inner surface of the flow path 31 is shaped like a step.

As shown in FIG. 4, the flesh portion 15d near the positioning surface 15c of the joint body 12S should not protrude into the L-shaped flow path 31 located at the boundary between the joint body 12S and the joint body 12L. In this way, the flow resistance of hot water in the flow path 31 can be reduced.

○ Delete the in-core 52 from the piping 50. In this case, an inner cylinder portion having the same function as the in-core 52 should be provided in the joint body 12.

DESCRIPTION OF SYMBOLS 11... Elbow pipe joint, 12... Coupling body, 12S... One coupling body, 12L... Other coupling body, 15c... Positioning surface, 20... Cap, 20a... Pipe insertion port, 23... Removal prevention mechanism, 51... Resin pipe , K...Zumi in and out.

Claims (2)

One joint body into which a resin pipe is inserted and connected, the other joint body into which a resin pipe of the same size as the resin pipe is inserted and connected, and the one joint body and the other joint body are respectively constructed and compatible. a retaining mechanism consisting of a one-touch joint for holding the resin pipe, and a cap for attaching the retaining mechanism to the corresponding joint body, the one joint body and the other joint body; In an elbow pipe joint where the and are arranged so that their axes intersect at right angles,
Each of the joint bodies is provided with a positioning surface that defines the insertion position of the corresponding resin pipe ,
The flesh portion of the one joint body near the positioning surface protrudes into an L-shaped flow path located at the boundary between the one joint body and the other joint body, and the flesh portion is connected to the flow path. In contrast, it penetrates into the vicinity of the axis of the other joint body,
If the intersection of the axis of the one joint body and the axis of the other joint body is used as a reference, the positioning surface of the one joint body may be set to The pipe insertion of the cap that is attached to the one joint body from the intersection point is provided at a position close to the intersection point and closer to the intersection point in the axial direction than a distance of half the inner diameter of the pipe insertion port of the cap. An elbow pipe joint in which the distance to the opening is shorter than the distance from the intersection to the pipe insertion port of the cap attached to the other joint main body. A method for constructing a conduit that overcomes a protruding and protruding groove, wherein two elbow pipe joints according to claim 1 are used, and the two joint bodies of the two elbow pipe joints are connected between the protruding and recessed grooves. Construction method for the pipeline to be placed.

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